WM8918

w WM8918 Ultra Low Power DAC for Portable Audio Applications DESCRIPTION The WM8918 is a high performance ultra-low power stereo DAC optimised for portable audio applications. The device features stereo ground-referenced headphone amplifiers using the Wolfson ‘Class-W’ amplifier techniques incorporating an innovative dual-mode charge pump architecture - to optimise efficiency and power consumption during playback. The ground-referenced headphone and line outputs eliminate AC coupling capacitors, and both outputs include common mode feedback paths to reject ground noise. Control sequences for audio path setup can be pre-loaded and executed by an integrated control write sequencer to reduce software driver development and minimise pops and clicks via Wolfson’s SilentSwitch™ technology. The analogue input stage can be configured for single ended or differential inputs. Up to 3 stereo microphone or line inputs may be connected. The input impedance is constant with PGA gain setting. A stereo digital microphone interface is provided, with a choice of two inputs. The analogue or digital microphone inputs can be mixed into the headphone or line output paths. A dynamic range controller provides compression and level control to support a wide range of portable recording applications in conjunction with the digital microphone interface. Anti-clip and quick release features offer good performance in the presence of loud impulsive noises. ReTuneTM Mobile 5-band parametric equaliser wit...